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ICSE Chemistry Mock Paper 2, The Heritage School

4 pages, 79 questions, 9 questions with responses, 9 total responses,    0    0
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The Heritage School First Term Examination - 2013 - 2014 Subject-Chemistry Class- X Time: 2hrs Full Marks : 80 Answers to this paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of this paper is the time allowed for writing the answers. Section I is compulsory. Attempt any four questions from Section ll. The intended marks for the questions or part of the questions are given in brackets [ ]. (40marks) Section-l Answer all the questions from this section Question - 1 (a) Name the following: i) A gas whose solution in water turns neutral litmus solution to blue. ii)A metallic oxide which is white in colour becomes yellow on heating but again becomes white on cooling. iii)A chloride salt which is insoluble in cold water but soluble in hot water. iv)A liquid which is a non- electrolyte. v) A light element in period -3 with a neutron/proton ratio around t5l 1. b)Aqueous Copper(l l)sulphate is electrolysed using Copper electrodes. i)Give the formulae of the ions present in Copper(ll) sulphate. ii) Explain why the anode decreases in mass. iii) Explain why the cathode increases in mass. iv)Write the chemical equation for the reaction at the 1. Anode 2. Cathode I5l c) i) Write the two steps necessary to convert insoluble lead carbonate into insoluble lead sulphate. ii) Define pH of a solution. iii)The pH values of two acids A and B of equimolar concentrations are 1 and 5 respectively. Which. is a stronger acid, A or B ? iv) What is the colour change by universal indicator in neutral solution? t5l d) i) A hydrocarbon X contains 92.3% of carbon by mass. l.Determine the empirical formula of X. 2.lf the vapour density of X is 13, find its molecular formula. ii)Calculate the percentage of nitrogen in ammonium nitrate( NH4N03) (Atomic mass : H=1; N=14; O ='t6) This paper consists of 4 printed pages Page t5I 1

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